P355NL1 Steel Plate is a low-alloy high-strength structural steel conforming to European standards, primarily used in manufacturing pressure equipment, low-temperature pressure vessels and pipelines, storage tanks, heat exchangers, and similar equipment.
P355NL1 Steel for boilers and pressure vessels Execution Standard
P355NL1 execution standard is EN10028-3. The delivery condition is typically normalized, though normalized rolling may be used based on agreement.
P355NL1 Fine grained structural steel for pressure vessels Delivery Condition
P355NL1 steel plate is usually delivered in the normalized state, but may also undergo normalized + tempered treatment based on technical requirements or customer needs.
P355NL1 Low Temperature Quality Steel Special Requirements
Features excellent low-temperature toughness, through-thickness properties, and non-destructive testing requirements. Through-thickness property requirements may include Z15, Z25, Z35 grades; non-destructive testing requirements may include Level I, Level II, Level III inspections.
EN10028-3 covers grades: P275NH, P275NL1, P275NL2, P355N, P355NH, P355NL1, P355NL2, P460NH, P460NL1, P460NL2.
P355NL1 Chemical composition & Temperature
P355NL1 Weldable Fine Grain Steels Mechanical Properties
P355NL1 steel plate exhibits excellent mechanical properties, mainly including yield strength, tensile strength, elongation after fracture, and impact toughness:
Yield strength: Not less than 355MPa.
Tensile strength: Typically 490~630MPa (some sources cite 450~610MPa or 400~650MPa).
Elongation after fracture: Typically 21%~22% (some sources cite 18%~25%).
Impact toughness: Not less than 27 Joules (J) at -40°C.
P355NL1 equivalent material
P355NL1, a European standard (EN 10028-3) for pressure vessel steel, has several equivalents in other standards. The most direct equivalent is ASME SA/A516 Grade 70. Other equivalents include DIN 17179 Grade FGP 36 T and ASME SA 707 Grade L2, ClSAss 2. P355NL1 is characterized by its good weldability and high toughness at low temperatures, making it suitable for pressure vessels and boilers.
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P355NL1 Steel Plate Surface Quality
The steel plate surface shall not contain cracks, blisters, scabs, folds, or inclusions. Permissible defects may be removed by grinding; grinding depth calculated from the actual plate dimension shall not exceed half of the thickness tolerance, while ensuring minimum plate thickness. Ground areas must be smooth without sharp edges. Delamination is not permitted. Other defects are permissible provided depth ≤ half the tolerance (calculated from actual dimension) and minimum thickness is maintained.
P355NL1 Steel Procurement Recommendations
Confirm application: Suitable for low-temperature pressure vessels, spherical storage tanks, petrochemical equipment, etc.
Check surface quality: Plate surface must be free of cracks, blisters, scabs; minor grinding acceptable if minimum thickness maintained.
Verify supplier qualifications: Choose certified suppliers (e.g., ISO9001) to ensure material compliance.
P355NL1 Key Purchasing Considerations
Consider operating environment: Select based on temperature and media. For low-temperature environments, prioritize low-temperature impact properties; in corrosive environments, request corrosion resistance data.
Specify processing requirements: Select appropriate plates for cold bending, stamping, or welding. For critical welding applications, ensure good weldability and request welding procedure specifications or test reports.
Focus on quality and certification: Source from qualified, reputable suppliers. Require quality inspection reports and material certificates; conduct third-party inspection if necessary. Ensure compliance with EN10028-3.
Confirm dimensional tolerances: Clearly define thickness, width, length parameters and tolerance ranges to meet design requirements.
Furnace temperature optimization settings: Compare actual steel temperature with standard heat treatment curves, while considering feedback values and production rhythm to dynamically adjust furnace temperatures, providing optimal temperature settings for primary systems.
Steel plate entry/exit scheduling: Determine plate movement based on furnace vacancy status, plates awaiting discharge temperature, and heat treatment line instructions.
P355NL1 Steel Plate Application Scope
P355NL1 is an alloy special steel for pressure equipment with excellent plasticity, toughness, cold-bending properties and weldability. Used in manufacturing:
Spherical storage tanks (>50 m³)
Single-layer roll-welded containers
Multi-layer hot sleeve roll-welded containers
Multi-layer wrapped containers (Class II/III)
Low-temperature pressure vessels
Widely applied in petroleum, chemical, power generation, and boiler industries for manufacturing reactors, heat exchangers, separators, spherical tanks, oil/gas tanks, liquefied gas tanks, boiler drums, liquefied petroleum gas cylinders, hydroelectric station high-pressure penstocks, and water turbine volutes.
Case:2024 P335nl1 shipped to Turkey
P355NL1 plates per EN 10028 3, thickness range [10–18 mm], for use in pressure-vessel manufacturing in Turkey.
P355NL1 vs P355NL2 differences between P355NL1 and P355NL2 steel:More Detail
